Do the Core i5-3570K and GeForce RTX 2080 bottleneck each other?

No. At 1080p (1920 x 1080) the Core i5-3570K keeps the GeForce RTX 2080 fed with a little headroom to spare, which is what a balanced build looks like. Expect about 61 fps on High.

How many fps do the Core i5-3570K and GeForce RTX 2080 get at 1080p (1920 x 1080)?

Around 61 fps on the High preset. The Core i5-3570K tops out near 75 fps and the GeForce RTX 2080 near 64 fps, and the lower of the two sets the frame rate.

Core i5-3570K + GeForce RTX 2080 Bottleneck Calculator

Whether the Core i5-3570K and the GeForce RTX 2080 hold each other back, at every resolution, with the frame rate you can expect and the single upgrade that fixes it.

Processor

Graphics card

Screen resolution

Graphics preset

Memory (RAM)

Primary usage

Estimates built from published benchmark data, not a test of your exact PC. How we calculate this.

The same pair at every resolution

A processor pushes roughly the same number of frames whatever the resolution. A graphics card pushes far fewer as pixels go up. That is why the limit moves as you climb this table, and why a bottleneck figure quoted without a resolution means nothing.

Resolution	Estimated fps	Limited by	Gap
720p (1280 x 720)	72 fps	CPU	14.5%
1080p (1920 x 1080)	61 fps	Balanced	3.2%
1440p (2560 x 1440)	46 fps	Balanced	0%
Ultrawide 1440p (3440 x 1440)	31 fps	GPU	17.2%
4K (3840 x 2160)	18 fps	GPU	52%
8K (7680 x 4320)	7 fps	GPU	81.1%

What to do about it

Nothing to fix. At 1080p (1920 x 1080) the Core i5-3570K has just enough headroom over the GeForce RTX 2080 to keep the card fed without wasting money on either side. This is what a balanced build looks like.

Modelled from published benchmark data, not measured on this exact combination. The indexes behind these figures and the sources they come from are on how we calculate this.